SQL Server Availability Groups
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1 A r c h i t e c t i n g SQL Server Availability Groups Without Losing Your S A N I T Y
2 Edwin Sarmiento Microsoft MVP/Microsoft Certified Master: SQL Server
3 no DEMOS
4 DESIGN at it s worst
5 DESIGN the starting point of any implementation
6 DESIGN should be driven by REQUIREMENTS NOT TECHNOLOGY
7 let s start with
8 RECOVERABILITY Recovery Point Objective (RPO) How much data can I afford to lose?
9
10
11 EXAMPLE RPO 12 hours June 10, :00AM Maximum data loss: -12 hours
12 when did the last backup occur
13 AVAILABILITY Recovery Time Objective (RTO ) When is my application coming back?
14
15 EXAMPLE RTO 12 hours June 10, :00AM Maximum outage: +12 hours
16
17 COMMITMENT Service Level Agreement (SLA) What have we agreed upon?
18 COMMITMENT Service Level Agreement (SLA) What was promised?
19 Cost RPO/RTO/SLA versus Cost Time
20 High Availability How do you increase uptime *? *typically in the SAME data center
21 High Availability How do you increase uptime *? *defined by RTO
22 Disaster Recovery How do you continue operation in case of catastrophic failure? *defined by RPO
23 Disaster Recovery How do you continue operation in case of catastrophic failure? *typically in a DIFFERENT data center
24 *also considers SAME data center failure Disaster Recovery How do you continue operation in case of catastrophic failure?
25 HA!= DR
26 SQL Server Availability Groups is NOT a new technology
27 SQL Server Availability Groups combination of DATABASE MIRRORING & FAILOVER CLUSTERING
28 how does it really WORK? FAILOVER CLUSTERING
29 stop service
30 stop service wait service
31 stop service wait service start service
32 failover clustering how it works SQL Server t r a d i t i o n a l 2-node cluster log data Windows Server Failover Cluster
33 failover clustering Application how it works SQL Server t r a d i t i o n a l 2-node cluster log data Windows Server Failover Cluster
34 failover clustering Application how it works SQL Server t r a d i t i o n a l 2-node cluster data log data *Availability Groups Windows Server Failover Cluster
35 what IS NOT commonly mentioned
36 failover clustering Application how it works AD/DNS SQL Server t r a d i t i o n a l 2-node cluster log data Windows Server Failover Cluster
37 WHY do we even care
38 we need to speak to the AD and DNS administrators
39 SQL Server Availability Groups basic architecture
40 Maximum of 5 replicas in SQL Server 2012 (1 primary and 4 secondary) and 9 replicas in SQL Server 2014/2016 (1 primary and 8 secondary) Primary Replica SQL Server Secondary Replica SQL Server Secondary Replica SQL Server log data log data log data Windows Server Failover Cluster
41 Application Commit secondary replicas are always running REDO Primary Replica SQL Server Secondary Replica SQL Server Secondary Replica SQL Server log data log data log data Windows Server Failover Cluster
42 AD/DNS 4 QUORUM SQL Server what about quorum determines the number of failures that the cluster can sustain while still remaining online. Windows Server Failover Cluster
43 AD/DNS SQL Server quorum majority VOTE wins * all NODES have a vote 4 QUORUM Windows Server Failover Cluster
44 decision-making based on MAJORITY can I get a VOTE?
45 AD/DNS SQL Server quorum types 4 QUORUM N o d e M a j o r i t y recommended for clusters with an ODD number of nodes Windows Server Failover Cluster
46 AD/DNS SQL Server quorum types 4 QUORUM N o d e & D i s k M a j o r i t y recommended for clusters with an EVEN number of local nodes Windows Server Failover Cluster
47 AD/DNS SQL Server quorum types 4 N o d e & D i s k M a j o r i t y uses a SHARED DISK as a WITNESS QUORUM Windows Server Failover Cluster
48 AD/DNS SQL Server quorum types 4 N o d e & D i s k M a j o r i t y this dates back to Windows NT 4.0 days QUORUM Windows Server Failover Cluster
49 AD/DNS SQL Server cluster + quorum 4!= N o d e & D i s k M a j o r i t y QUORUM Windows Server Failover Cluster
50 AD/DNS SQL Server quorum types Node & File Share Majority 4 QUORUM uses FILE SHARE as a WITNESS instead of a disk Windows Server Failover Cluster
51 AD/DNS SQL Server quorum types 4 QUORUM N o M a j o r i t y : D i s k O n l y can sustain failures of all nodes except one if the disk is online *NOT RECOMMENDED Windows Server Failover Cluster
52 AD/DNS SQL Server quorum types 4 QUORUM C l o u d W i t n e s s uses the concept of a file share witness on Microsoft Azure *Windows Server 2016 and higher Windows Server Failover Cluster
53 AD/DNS SQL Server quorum goal is to have ODD/MAJORITY 4 number of votes QUORUM Windows Server Failover Cluster
54 HOW do you choose the appropriate quorum model
55 HOW do you choose the appropriate quorum model let your REQUIREMENTS guide your choice
56 multi-subnet clusters WHERE do you place the quorum
57 ideally, it should be on a SEPARATE l o c a t i o n WHERE do you place the quorum
58 Windows Server Failover Cluster SQL Server SQL Server log data PRODUCTION log DR data
59 it should be in the SAME location as what you are trying to protect WHERE do you place the quorum
60 SQL Server Availability Groups COMMON DESIGN PATTERNS
61 SQL Server Availability Groups COMMON DESIGN PATTERNS What will be your QUORUM model?
62 SQL Server Availability Groups COMMON DESIGN PATTERNS What will be your REPLICATION MODE?
63 SQL Server Availability Groups COMMON DESIGN PATTERNS What will be your NETWORK CONFIGURATION?
64 SQL Server Availability Groups COMMON DESIGN PATTERNS What will be your LICENSING MODE?
65 2 Replicas, Stand-alone instances (HA only) PRODUCTION Primary Replica Secondary Replica SQL Server SQL Server log data log data Windows Server Failover Cluster
66 *You need to discuss this with your network team 3 Replicas, Stand-alone instances (HA + DR) PRODUCTION DR Primary Replica Secondary Replica * LowerQuorumPriorityNodeID Site Awareness R2 Secondary Replica * NO VOTE 2008/2012 SQL Server SQL Server SQL Server log data log data log data Windows Server Failover Cluster
67 *You lose the ability to do automatic failover (on the Availability Group-level) 2 Replicas, FCI + Stand-alone instance (HA + DR) PRODUCTION DR * LowerQuorumPriorityNodeID Site Awareness Primary Replica R2 Secondary Replica * NO VOTE 2008/2012 SQL Server SQL Server log data Windows Server Failover Cluster
68 *You lose the ability to do automatic failover (on the Availability Group-level) 3 Replicas, FCI + Stand-alone instance (HA + DR + ) PRODUCTION Primary Replica DR * LowerQuorumPriorityNodeID Site Awareness R2 Secondary Replica * NO VOTE 2008/2012 Additional Data Center * LowerQuorumPriorityNodeID Site Awareness R2 Secondary Replica * NO VOTE 2008/2012 SQL Server SQL Server SQL Server log data log data Windows Server Failover Cluster
69 *You lose the ability to do automatic failover (on the Availability Group-level) 2 Replicas, FCI (HA + DR) PRODUCTION Primary Replica DR * LowerQuorumPriorityNodeID Site Awareness * NO VOTE 2008/ R2 Secondary Replica SQL Server SQL Server Windows Server Failover Cluster
70 3 Replicas, Stand-alone instances (HA + DR) PRODUCTION DR Additional Data Center does this even make sense? SQL Server SQL Server SQL Server log data log data log data Windows Server Failover Cluster
71
72
73 in SUMMARY
74 DESIGN according to REQUIREMENTS
75 REFERENCES
76 REFERENCES AlwaysOn Architecture Guide: Building a High Availability and Disaster Recovery Solution by Using AlwaysOn Availability Groups
77 How many of you are interested to DIVE DEEPER into Windows Server Failover Clustering for SQL Server
78
79
80 Edwin Sarmiento Microsoft MVP/Microsoft Certified Master: SQL Server Q & A QUESTIONS
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